User terminal and radio communication method

Abstract

To appropriately control communication even when a reference signal is dynamically triggered, a user terminal according to one aspect of the present disclosure includes: a receiving section that receives a downlink shared channel and a Channel State Information (CSI) reference signal; and a control section that, when first downlink control information used to schedule the downlink shared channel and second downlink control information used to trigger the CSI reference signal are transmitted by different cells, and resources respectively indicated by the first downlink control information and the second downlink control information overlap, performs control not to perform at least one of reception of the downlink shared channel and measurement that uses the CSI reference signal.

The invention claimed is: 
     
       1. A terminal comprising:
 a receiver that receives a first downlink control information for use in scheduling a downlink shared channel, and a second downlink control information for use in triggering a channel state information (CSI) reference signal (CSI-RS); and 
 a processor that, when a resource of the CSI-RS is indicated by the second downlink control information, assumes that the resource of the CSI-RS is not used for the downlink shared channel, 
 wherein a plurality of candidates of the resource indicated by the second downlink control information is configured by a radio resource control (RRC) signaling, and 
 wherein the plurality of candidates each contains an index, the index corresponding to a code point of a bit field included in the second downlink control information, and the resource is indicated by notification of the index corresponding to the code point. 
 
     
     
       2. A radio communication method for a terminal, comprising:
 receiving a first downlink control information for use in scheduling a downlink shared channel, and a second downlink control information for use in triggering a channel state information (CSI) reference signal (CSI-RS); and 
 when a resource of the CSI-RS is indicated by the second downlink control information, assuming that the resource of the CSI-RS is not used for the downlink shared channel, 
 wherein a plurality of candidates of the resource indicated by the second downlink control information is configured by a radio resource control (RRC) signaling, and 
 wherein the plurality of candidates each contains an index, the index corresponding to a code point of a bit field included in the second downlink control information, and the resource is indicated by notification of the index corresponding to the code point. 
 
     
     
       3. A base station comprising:
 a transmitter that transmits a first downlink control information for use in scheduling a downlink shared channel, and a second downlink control information for use in triggering a channel state information (CSI) reference signal (CSI-RS); and 
 a processor that, when the second downlink control information indicates a resource of the CSI-RS, performs a control so as not to use the resource of the CSI-RS for the downlink shared channel, 
 wherein the processor configures, by a radio resource control (RRC) signaling, a plurality of candidates of the resource indicated by the second downlink control information, and 
 wherein the plurality of candidates each contains an index, the index corresponding to a code point of a bit field included in the second downlink control information, and the processor indicates the resource by using the code point. 
 
     
     
       4. A system comprising a base station and a terminal, wherein:
 the base station comprises:
 a transmitter that transmits a first downlink control information for use in scheduling a downlink shared channel, and a second downlink control information for use in triggering a channel state information (CSI) reference signal (CSI-RS); and 
 a first processor that, when the second downlink control information indicates a resource of the CSI-RS, performs a control so as not to use the resource of the CSI-RS for the downlink shared channel, 
 wherein the first processor configures, by a radio resource control (RRC) signaling, a plurality of candidates of the resource indicated by the second downlink control information, and 
 wherein the plurality of candidates each contains an index, the index corresponding to a code point of a bit field included in the second downlink control information, and the first processor indicates the resource by using the code point; and 
 
 the terminal comprises:
 a receiver that receives the first downlink control information and the second downlink control information; and 
 a second processor that, when the resource of the CSI-RS is indicated by the second downlink control information, assumes that the resource of the CSI-RS is not used for the downlink shared channel.